a {
  color: #303133;
  text-decoration: none;
}

body {
  font-family: PingFang SC, Verdana, Helvetica Neue, Microsoft Yahei, Hiragino Sans GB, Microsoft Sans Serif, WenQuanYi Micro Hei, sans-serif;
}

* {
  outline: none;
}

ul, li {
  padding: 0;
  margin: 0;
}

ul {
  list-style: none;
}

.pd-lr-20 {
  padding: 0 20px;
  box-sizing: border-box;
}

.mg-tb-20 {
  margin: 20px 0;
}

.mg-lr-20 {
  margin: 0 20px;
}

.pd-tb-20 {
  padding: 20px 0;
  box-sizing: border-box;
}

.pd-20 {
  padding: 20px;
  box-sizing: border-box;
}

.flex-end {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.flex-start {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.w450 {
  width: 450px;
}

.overflow-auto {
  overflow: auto;
  height: 100%;
}
